Strinding toy horse



July 9, 1963 R. E. THOREN STRIDING TOY HORSE 3 Sheets-Sheet 1 Filed Oct. 24, 1958 R m m m 1905627 5 THOKF/V MWKQW July 9, 1963 R. E. THOREN STRIDING TOY HORSE 3 Sheets-Sheet 2 Filed Oct. 24, 1958 INVENTOR. Pose/2'7 5. THOFEA/ A r rOPA/EMS July 9, 1963 R. E. THOREN STRIDING TOY HORSE 3 Sheets-Sheet 3 Filed Oct. 24, 1958 INVENTOR. ROBERT E TI /OPEN United States Patent 3,096,990. STRIDING TOY HORSE Robert Edward Thoren, Box 743, Moses Lake, Wash. Filed Oct. 24, 1958, Ser. No. 769,468 2 Claims. (Cl. 2801.182)

The toy horse of the present invention is of the type intended to be ridden by a child. In the action of thus being ridden, the front and rear legs of the horse will spread and contract alternately to effect a striding action. By mounting the legs of the horse on wheels and controlling the progress of the wheels, the horse can be moved along the ground.

In a striding horse of this type, it is an object to control the swinging of the horses legs resiliently by springs which are of compact arrangement and located relative to the legs and body so that such springs will be concealed by the body of the horse at all times, both to provide an attractive appearance for the horse and to avoid the clothing of a child being caught in the spring. It is also an object to connect the springs to the legs in a manner such that the deflection of the springs will be small for a given degree of swing of the legs while at the same time making the springs sensitive to a displace ment of the childs weight while being relatively insensitive to different total weights of different children who may ride the horse. Despite such compact spring arrangement, it is an object to enable helical tension springs of substantial length to be utilized so that a comparatively large deflection can be effected by a comparatively small change in location of the riders weight.

Another object is to utilize a spring arrangement the prestressed condition of which can be altered rather easily to accommodate the horse for use by children differing greatly in weight and which will facilitate assembly of the spring structure of the horse.

It is also an object to provide a leg and frame structure of simple construction incorporating few parts which is also strong, rugged and stable. Such a leg and frame structure can be manufactured and assembled easily and quickly and is well adapted to quantity production. If desired, the leg and frame structure can be constructed so that its parts are permanently interconnected or connections can be provided for the major components which can be assembled easily so that the horse can be shipped with its parts disconnected and assembled readily at its destination.

While striding action of the horses legs can effect movement of the horse along the ground, it is also an object to provide an arrangement so that the legs of the horse will merely be spread and contracted without effecting progressive movement of the horse.

Another object is to provide wheels supporting the horse for movement along the ground and in connection with such wheels to provide brakes which can be manipulated by the child rider at will to retard or stop movement of the horse along the ground.

The foregoing objects can be accomplished by a leg and frame structure for the horse which is of tubular construction including one tube constituting the body framework for the horse, a second tube constituting the front leg support for the horse, and a third tube constituting the rear leg support. These three tubes are pivotally interconnected and each leg tube is connected near its upper end to a spring which will be deflected by relative swinging of the leg tubes. Springs, one for each leg, may be interconnected directly to react oppositely or the springs for the front and rear legs may be interconnected through the body frame tube. If helical tension springs are used, longer springs can be employed by arranging the springs connecting the upper portions of the leg tubes with the body frame tube in crossed relationship. The arrangement for effecting progressive movement of the horse along the ground includes arms pivoted about the axles of the wheels which are of a length such that their lower ends will engage the ground to permit movement of the front and rear wheels in only one direction along the ground. As the legs spread and contract, the front wheels and the rear wheels will move alternately in the direction of progress. Brake means, which may be actu ated by a foot of the rider, can be provided to engage one or more of the wheels, preferably the front wheels, to retard or stop movement of the horse.

FIGURE 1 is a top perspective view of a preferred form of striding toy horse with parts broken away and showing the body of the horse in phantom.

FIGURE 2 is a side elevation view of the horse with parts broken away, the body of the horse again being shown in phantom and the parts of the horse being shown in broken lines in a different relationship to each other.

FIGURE 3 is a top perspective view, and FIGURE 4 is a side elevation view of a fragmentary portion of an alternative type of horse structure with parts broken away.

FIGURE 5 is a top perspective view of a front portion of the horse, with parts in exploded relationship, and FIGURE 6 is a top perspective view of a rear portion of the horse structure, with parts in exploded relationship.

FIGURE 7 is a front elevation view of a front portion of the horse with parts broken away, showing brake structure.

FIGURE 8 is a bottom perspective view of the seat frame component of the horse employed in the structure shown in FIGURES 1 and 2.

FIGURE 9 is a side elevation view of a different form of horse body frame and leg structure, the parts being shown in a different relationship in broken lines.

FIGURE 10 is a top perspective view of the spring mechanism utilized in the horse construction of FIGURE 9, parts being broken away, and FIGURE ll is a sectional view through such spring structure taken on line 1111 of FIGURE 10.

As shown in FIGURES 1 and 2, the horse consists of a body frame including a horizontal tubular portion 1 and a neck tubular portion 2 integral with and extending upwardly from the forward end of the horizontal tubular portion. To the forward part of the horizontal tubular portion is secured a fitting 3 constituting a mounting for a pivot 4 swingably supporting a front leg strut 5. Preferably this strut is tubular, extends downwardly from the fitting 3, and has a forwardly curved lower portion on which wheels can be mounted. A rear fitting 6 is secured to the body frame tube 1 rearwardly of the front fitting 3 and has a pivot 7 swingably supporting the rear leg strut 8.

The frame also includes a metal saddle 9, the underside of which is shown in perspective in FIGURE 8. Preferably this saddle is mounted on the upper end of the fitting 6. The saddle is further supported by a forward post 10, the upper end of which is integral with the saddle, and the lower end of which is formed as a crotch 11 shaped to fit the curvature of the horizontal tubular member 1. The fittings 3 and 6 can be secured permanently to the horizont-al tube such as by welding or riveting. It is preferred, however, in the form of horse shown in FIGURES 1 and 2, that such fittings be removably secured to the tubular member. Thus the fitting 3 is shown as being secured by a bolt 12 extending through the upper portion of the fitting and the tube which can be removed to enable the fitting to be slid lengthwise of the tube and removed from it. A permanent connection could be effected by replacing this bolt with a rivet.

As shown best in FIGURE 8, the rear fitting 6 is not itself clarnped to the tubular portion 1 of the frame, but

simply is connected to such member by the tubular member passing through the aperture 13 in the fitting. A cross aperture could, of course, be provided through the aperture 13 to receive a set screw, bolt or rivet for securing the fitting in place relative to the tubular portion 1. The fittingis effectively secured in place, however, by providing in the tubular member 1 a vertical .aperture registering with a hole '14 in the lower end of the post 10. Thus a bolt 15 can be passed through such a hole in the tubular member 1 and screwed into the hole 14 to secure in place both the fitting 6- and the saddle 9.

As shown in FIGURE 2, the pivot pins 4 and 7 for the front and rear leg struts and 8 pass through the lower portions of the fittings 3 and 6 which are formed as skirt-s. These skirts are sufficiently wide in a fore and aft direction or flare downwardly sufliciently with respect to the size of the strut ends extending upwardly into the fittings that such struts may swing relative to the fittings through substantial angles. Swinging of these'struts toward each other is limited by engagement of the struts with edge portions of the fittings as shown in full lines in FIGURE 2. Such engagement will therefore establish the contracted relationhip of the leg struts and the struts may swing relative to each other and to the frame into a spread condition such as indicated in the broken lines in FIGURE 2.

The front and rear leg struts are urged toward contracted position by spring means which, in the form of horse shownin FIGURES 1 and 2, are helical tension springs. One of these springs :16 is connected between the upper portion of the rear leg strut 8 and the forward portion of the frame. A band 17 may be riveted to th rear leg strut at the desired elevational location and have a lug 18 on its forward side to which the rearward end of the spring 16 is connected. The forward end of the spring may be connected to a lug 19 on the rearward side of the front fitting 3. Thus the spring 16 will be inclined forwardly and upwardly from the lug 18 to the lug 19. Such spring preferably includes a turnbuckle 20 between such lugs for adjusting the spring tension by altering the minimum length of the spring coil.

To afford a rather long spring while still anchoring the spring means between the upper portions of the leg struts and the body frame, the spring means connecting the upper end portion of the frontleg strut 5 with the body is arranged in crossed relationship with the spring 16. In,

order to balance the crossing springs and to afford additional spring force between the upper portion of the front leg strut 5 and the body, two springs are provided for the front leg strut. Such springs 21 are located on opposite sides respectively of the spring 16 and are connected between the upper portion of the front leg strut 5 and a portion of the body frame of the horse a substantial distance rearwardly from the lug 19 to which the upper and forward end of spring 16 is connected.

A hand 22 encircling the upper portion of the front leg strut 5.is secured to it by a rivet and has a lug 23 on its rearward side to which the spring means for the front leg strut can be connected. The forward and lower ends of the springs 21 are shown in FIGURE 1 as being interconnected by a spreader bar 24. While this bar could be connected directly in close-coupled fashion to the lug 23, it is preferred that such connection be effected by a turnbuckle 25 which can be adjusted to vary the spacing between the lug 23 and the spreader bar for the purpose of altering the minimum length and consequently the initial or prestressed tension of the springs 21.

The rearward ends of the springs .21 can be anchored to lugs 26 carried by and projecting downward from the rearwardportion of the saddle 9 as shown best in. FIG- URES 2 and 8. Such mounting of the lugs enables them to be located in position spaced apart a considerable distance transversely of the horse without providing a special mounting for them on the tubular member 1. Thus the springs 21 will slope upwardly and rearwardly from the lug 23 to the lugs 26, and the distance between these 4 lugs will be approximately the same as the distance between lugs 18 and 19 as shown best in FIGURE 2. The forward lugs 23 and 19 are in substantially vertical alignment and the rearward lugs 18 and 26 are in substantially vertical alignment when the struts are in contracted relationship.

It will also be noted in FIGURE 2 that the pivot 7 for the upper end of the rear leg strut 8 is located substantially centrally beneath the saddle 9 which is desirable to facilitate movement of the leg struts toward spread rel-ationship by a child sitting in the saddle 9 leaning forwardly, although the tension force exerted by springs 16 and 21 in their prestres'sed condition is quite great. By providing such a considerable initial tension of these springs, the front and rear struts will be spread acomparatively small amount by a substantial increase in the force exerted directly downward on the saddle 9 effected by a heavier child sitting in the saddle. Because of this arrangement, therefore, an increased force acting directly downward on the saddle 9' will not have a great tendency to spread the leg struts, but a relatively small downward force when moved forward from a position above the rear leg strut 8, as effected when the child leans forward as in riding, will cause the front and rear leg struts to spread in opposition to the tension exerted by the springs 16 and 21.

In FIGURES 3 and 4, a somewhat different frame structure for the horse is illustrated. In this case, the front fitting 3' carrying the pivot 4 is welded directly to the horizontal tubular portion 1 of the frame. front leg strut 5 and the springs 16 and 21, and their disposition and anchoring arrangement are, however, substantially the same as described above. In this instance, however, the curvature of the upper portion of the rear leg strut 8' is considerably greater than in the case of the strut 8 shown in FIGURE 2. Consequently, the upper end of this strut and itspivot 7 are located considerably farther forward along the horizontal frame member 1 and with respect to the metal saddle memher 9.

In this construction, the fitting 6 is welded directly to the underside of the tubular member 1, as is the fitting 3', and it is located beneath the forward portion of the saddle 9'. The front post 10 of the saddle also is Welded directly to the tubular frame member 1 and the saddle further has a central post 27 supporting it, the lower end of which also is welded directly to the tubular member 1. With this arrangement, the spreading action of the front leg strut and the rear leg strut is more sensitive to forward shifting of the riders weight because the location of the pivot 7 is closer to the line of force of spring 16 than the distance between pivot 7 and the line of force of spring 16 in the arrangement of FIGURE 2. Even where a welded construction is employed, however, the fitting 6 could be located farther rearwardly in a position corresponding to the location of the fitting 6 shown in FIGURES l and 2 if desired.

Details of a preferred type of leg strut mounting are shown in FIGURES 5 and 6. In FIGURE 1 the lower ends of the leg struts are shown as being connected to the central portions of front and rear tubular yokes 28 and 29, respectively, through the lower end of which yokes extend the front and rear axles 30 and 31, respectively. Wheels 32 are mounted in conventional fashion on the opposite ends of these axles. Each axle carries a ground-engaging arm 33, one end portion of which is mounted swingably on the axle in each instance. Each of the arms has a ground-engaging friction tip 34 and the arm is of a length sufiicient so that it will be at a substantial angle both to the ground and to vertical when the ground-engaging tip is in contact with the ground.

Conveniently, the angle of the leg relative to the ground can be approximately 45, but it should not be much less than that angle.

'In order to enable the horse to be steered as it moves along the ground, the front yoke 28 is swiveled on the The lower end of the front leg strut and FIGURE 5 shows components of a suitable swivel joint between such strut and yoke. A die-cast angle fitting 35 has a boss 36 of a size to fit Within the lower end of the front leg strut 5 and such boss can be secured within the hollow strut end by a rivet 37 or a bolt extending through registering apertures in the boss and strut end. The other end of the fitting 35 has a stem 38 extending downward through an aperture 39 in a generally T-shaped fitting 40 having horizontal bosses 41 extending oppositely to fit into the hollow end portions of sections of the front yoke 28. Such bosses can be secured to such yoke portions by rivets 42 passing through holes extending transversely of the bosses 41 and the yoke ends 28.

When the stem 38 has been inserted through the aperture 39, it can be secured in place by a nut 43 screwed onto the threaded end of stem 38. Movement of the stem downward into the aperture will be limited by engagement of the enlarged shoulder 44 on fitting 35 with the enlarged shoulder 45 on fitting 40. These shoulders will provide good thrust bearing surfaces slidable relative to each other as the yoke 28 is swung relative to the front leg strut 5. The tightness of the fit between the shoulders 44 and 45 can be regulated by the tightness of the nut 43 pressing against lockwasher 46 on the threaded end of stem 38 to establish the effort which will be required to swing the yoke 28 for steering.

The rear leg strut 8 can be mounted on the tubular rear yoke 29 in a generally comparable fashion by a T-shaped fitting 47. This fitting has oppositely extending transverse bosses 48 of a size to fit in the hollow ends of the yoke sections 29. Such bosses and yokes are secured together by rivets 49 extending through registering holes in the bosses 48 and yoke members 29. The fitting also includes an upwardly extending boss 50 of a size to be received in the hollow lower end of the rear leg strut 8. Such leg strut end and boss can be secured together by a bolt 51 extending through registering apertures in such boss and the strut end for easy assembly and disassembly or these parts can be secured together permanently by rivets if desired.

If desired, the horse can be provided with brake structure shown generally in FIGURE 1 and in detail in FIGURE 7. The brake shoe 52 of friction material is mounted on the lower end of an upright reciprocable rod 53 guided for vertical movement by an aperture in a lug 54 on the yoke 23 through which such rod passes as shown in FIGURE 7. The upper end of rod 53 is connected by pivot 55 to the swinging end of brake lever 56 which is mounted by pivot 57 on the upper end of post 58 projecting upwardly from yoke 28. The brake lever 56 normally constitutes a foot rest when the foot is located generally over the post 58. If the riders foot is moved outward along the brake lever 56 and pushed downward, such lever will be swung toward the broken line position shown in FIGURE 7 to depress its outer end and reciprocate rod 53 downward so as to press the brake shoe 52 into wedging engagement with the wheel 32. When such pressure is released, the helical compression spring encircling rod 53 and bearing upward against a shoulder 60 on it will lift the rod back up into the full line position shown in FIGURE 7 thereby lifting the brake shoe out of engagement with the wheel and releasing the brake.

The body of the horse shown in phantom in FIGURES 1 and 2 can be made of molded rubber, of thin wall structure, having an opening in its belly portion. Such opening can be spread and the hollow body simply fitted onto the frame composed of the tubular portions 1 and 2 and the saddle 9 or 9' in the manner indicated in FIGURES 1 and 2. The upwardly extending portion 2 of the frame will fit up into the hollow neck of the horse body and such body can be secured to the frame by a handle member 61 extending through apertures in the neck of the horse body and an aperture in the upper 6 end of the upright tubular portion 2. It will be noted that the rubber body is formed with a portion complemental to the saddle member 9 or 9' which will fit closely over such saddle member to constitute a seat for the rider.

If the rider wishes the horse to progress along the ground as the rider swings forwardly and rearwardly in the saddle, the arm members 33 will be in the lowered positions shown in full lines in FIGURES l and 2. The horse will then move progressively in one direction as it is deformed alternately between the contracted position shown in full lines in FIGURE 1 and the striding position shown in broken lines in that figure. As the leg struts are spread, the front wheel will roll forward while the rear wheel is held stationary by its arm 3-3, and as the rider swings backward again, the arm 33 of the front axle will prevent retrograde movement of the forward wheels while the rearward wheel troll toward the forward wheels. When the rider then swings forward again, the rearward Wheels once more will be held against backward movement by their stop arm 33 while the forward wheels move forward through 81101111611 increment.

If at any time it should be desired that the horse not move forward as the rider swings forwardly and rearwardly, the stop arms can be swung upward into latched position in which their lower ends 34 engage the latch fingers 62 shown generally in FIGURES 1 and 2. Even if only one of such fingers is moved upward into latched position as the rear arm is shown in broken lines in FIGURE 2, the horse will make little or no progres along the ground. Such latch fingers are shown in detail in FIGURES 5 and 6 as being mounted by screws onto the fittings 40 and 47, respectively. Alternatively, if it desired to have the horse move progressively rearwardly rather than forwardly, both arms 33 can simply be swung into forwardly and downwardly inclined positions instead of rearwardly and downwardly inclined positions, as is indicated in broken lines for the forward arm 33 in FIGURE 2.

In the alternative type of horse construction shown in FIGURES 9, 10 and -11, the general structure of the body tube, of the leg struts and of the wheel arrangement supporting them can be approximately the same as described above and, consequently, the several parts of this alternative form of horse are numbered correspondingly and not described again. The principal difference in the construction of this horse is in the spring arrangement acting on the front and rear leg struts and the connection between such struts and the body frame. In this instance the saddle 9 has front and back tubular fittings 63 and 64 fitting over the body tube 1 which may be secured to such tube by rivets, bolts, welding or other desired manner. The front tubular fitting 63 has a lug 65 projecting downwardly from it to which the leg structure is connected by a bolt 66 shown in FIGURE 10 a being screwed up into a threaded hole in such lug.

The mounting for the leg struts thus engaged by the bolt 66 is a strip 67 having a central aperture to receive the bolt and having its opposite ends curved downwardly trom a central horizontal portion. Such downwardly curved end portions have slots 68 in them extending lengthwise of the strip and through which slots extend the upper end portions of the front and rear leg struts 5 and 8. Pivot rods 4 and 7 extend through apertures in the end portions of the struts 5 and 8', respectively, which extend through the slots 68 and toward each other as shown in FIGURE 10.

The pivot rods 4' and 7' extend for a considerable distance beyond the opposite sides of the struts 5' and 8' and pass through apertures in the centers of end plates 69 and 70 of the front and rear spring devices. In this instance the spring devices are cylindrical blocks 71 and 72, respectively, of elastomer material which may be a natural lubber material, a synthetic rubber material or a plastic material of some other type having comparable characteristics. The front rubber spring block 71 has its oppositeends vulcanized to the end plates 69, and the upper end of the front leg strut i embedded in it andmay be vulcanized'in-it. Correspondingly, the rear spring block 72 of rubber or elastomer material has its opposite ends vulcanized to endplates 70, and the upper end of the rear leg strut is embedded in such block and may be vulcanized to it.

Each ot the end plates 69 has in it an arcuate row of circumferentially spaced apertures extending at least along and adjacent to the side of the plate closer to the rear block spring 72. Similarly, each of the end plates 70 has an arcuaterow of circumferentially spaced apertures adjacent to its side nearer the block spring 71. The two spring assemblies are then connected by straps 75. Each of these straps has an aperture in each end portion fitting over an end of a pivot block 4' or 7'. Between the apertures fitting the pivot rods are apertures spaced for registry with selected ones of apertures 73 and 74, respectively. Intermediate portions of the straps 75 can then be connected to the end plates 69 and 70 by wing screws 76 and 77 passing through apertures in the straps 75 and into a selected one of the apertures 73, 74 in each instance.

It will be evident that the farther end plates 69 are turned in a counter clockwise direction as seen in FIG- URE and secured by wing screws 76 engaged in apertures 7 3 at opposite ends of the spring block 71, the greater will be the initial stress in that spring block. Similarly, the [farther end plates 70 are turned in a clockwise direction as seen in FIGURE 10 and held by wing screws 77 engaged in registering apertures 74, I re greater will be the initial stress in spring block 72. By such adjustment, therefore, between the end plates 69 and 70 and the straps 75, the yieldability of the leg struts 5 and 8 to spread as a child rocks backward and forward in the saddle 9' will be regulated. Also, by such adjustment the amount of spreading action of the leg struts effected by children of different weight will be regulated, as the torque app-lied to the elastomer blocks 71 and 72 by the struts 5 and 8' is opposed by the resilient resistance of such block to torsion.

The rubber body of the horse can be assembled onto the frame shown in FIGURE 9 in the same manner as described in connection with FIGURES 1 and 2. It will be evident that the belly portion of the horse body will cover compl etelythe spring arrangement interengaged between the front and rear leg struts whether the type shown in FIGURES 1 and 2 or the type shown in FIGURES 9, 10 and 11 is used. Also, as indicated in broken lines in FIGURE 9, the general striding action of the leg struts will be similar for bothtypes of construction, and the manner in which the i orse, progresses along the ground will be the same. As the leg struts 5 and 8 of FIG- URES 9 and 10 spread, of course, the spring blocks will be further deformed by relative rotation of the embedded ends of the struts and the end plates of the springs, and when the strut spreading force is relieved the deformation of the rubber blocks will effect contracting movement of the stmt again. The striding action of the horse thus effected by the spring means of both types described will therefore be similar.

I claim as my invention:

1. A striding toy horse comprising a body frame member, a fitting mounted on said body frame member and having a skirt projecting downwardly therefrom, front and rear leg struts depending from said body frame memher, one of said struts having its upper end extending upwandly within the skirt of said fitting, a pivot extending through said fitting skirt and the end of said leg strut reoeived therein for mounting said leg strut, spring means connected to said pivotally mounted leg strut and urging it to swing in one direction, and said fitting including stop members below said pivot engageable by said pivotally' mounted leg strut and limiting swinging movement of said leg strut in opposite directions effected by said spring means.

v2. A striding toy horse comprising a body frame including a horizontal tubular member, fittings mounted on said tubular member and having skirts projecting downwardly therefrom, front and rear leg struts having upper ends extending upwardly within the skirts of said fittings, respectively, a pivot extending through each skirt and the end of the leg strut received therein supporting said leg strut depending from said, tube, and spring mean connected to said leg struts and urging them to swing toward each other, each of said fittings including a stop rib engageable hy the leg strut :carried by that fitting and limiting swinging movement of said leg struts toward each other.

References Cited in the file of this patent UNITED STATES PATENTS 1,426,171 Fredrich et al Aug. 15, 1922 1,667,932 Hamel May 1, 1928 1,714,270 Kaufman et al May 21, 1929 2,259,987 Bailie Oct; 21, 1941 2,476,915 Romero et al. July 19, 1949 2,635,886 Schoebel Apr. 21, 1953 2,651,527 Thoren Sept. 8, 1953 2,699,228 Mennesson Jan. 11, 1955 2,738,199 Rand Mar. 13, 1956 2,768,833 Sidolf Oct. 30, 1956 2,802,671 Slcoggard Aug. 13, 1957 FOREIGN PATENTS 483,209 France Mar. 17, 1917 570,276 France Jan. 5, 1924 961,917 France Nov. 28, 1949 134,456 Great Britain Nov. 6, 1919 

1. A STRIDING TOY HORSE COMPRISING A BODY FRAME MEMBER, A FITTING MOUNTED ON SAID BODY FRAME MEMBER AND HAVING A SKIRT PROJECTING DOWNWARDLY THEREFROM, FRONT AND REAR LEG STRUTS DEPENDING FROM SAID BODY FRAME MEMBER, ONE OF SAID STRUTS HAVING ITS UPPER END EXTENDING UPWARDLY WITHIN THE SKIRT OF SAID FITTING, A PIVOT EXTENDING THROUGH SAID FITTING SKIRT AND THE END OF SAID LEG STRUT RECEIVED THEREIN FOR MOUNTING SAID LEG STRUT, SPRING MEANS CONNECTED TO SAID PIVOTALLY MOUNTED LEG STRUT AND URGING IT TO SWING IN ONE DIRECTION, AND SAID FITTING INCLUDING STOP MEMBERS BELOW SAID PIVOT ENGAGEABLE BY SAID PIVOTALLY MOUNTED LEG STRUT AND LIMITING SWINGING MOVEMENT OF SAID LEG STRUT IN OPPOSITE DIRECTIONS EFFECTED BY SAID SPRING MEANS. 